Here are your options, none of which are ideal:
* Find the crank: This is the best solution. Check your owner's manual storage compartment, under the seats, in the glove box, or anywhere else tools might be stored in your truck. Look in any storage bags that came with the truck. Maybe a previous owner misplaced it.
* Improvise a crank: This is extremely risky and could damage your truck. You'd need a tool with a handle and a mechanism that precisely fits the square drive of your spare tire lowering mechanism. Improvising is highly discouraged due to the risk of damaging the mechanism or the tire itself.
* Call for roadside assistance: This is the safest and most recommended option. Roadside assistance can likely get your spare tire down for you.
* Tow the truck: If you can't lower the spare and need a spare tire urgently, towing your truck to a mechanic or tire shop is your only other real option.
In short: Don't attempt to force it or improvise a crank without a clear understanding of the mechanism. The risk of damage far outweighs any potential benefits. Contacting roadside assistance is the best course of action.
